<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div></div>
</body>
</html>
<script>
    const div = document.querySelector('img')


    // function ajax(url,method = 'get') {
    //     // console.log(url);
    //     console.log('method',method);
    // }
    // console.log(img);

    function ajax(url,successFn,errorFn,method = 'get'){
        
        const xhr = new XMLHttpRequest()
        xhr.open(method,url,true)
        xhr.send()
        xhr.onload = function(){
            const data = JSON.parse(xhr.response)
            successFn(data)
        }
        xhr.onerror = function(err){
            errorFn(err)
        }

    }
    

    ajax('http://127.0.0.1:8899',(data) => {
        console.log(data);
    },(err) => {
        console.log('报错',err);
    })

    








</script>